Bringer gripper for looms without shuttles

ABSTRACT

A bringer gripper for looms without shuttles, where the weft yam is placed in an upper notch and in a gripping organ, particularly suitable for the simultaneous presentation of one or more wefts to the warp inlet and to the taker gripper, in which the upper notch is shaped with a multiple number of throats of different axial length. The weft yarns fit into the bottom of these throats and are essentially offset in the gripper&#39;s direction of motion.

BACKGROUND OF THE INVENTION

This invention refers to a bringer gripper for the weft yarn in textilelooms without shuttles.

More in detail, this invention refers to a gripper for the feeding ofweft yarns to the grippers of looms without shuttles, suitable forprocessing multiple weft yarns at the same time, by presenting them atthe warp inlet to the taker gripper, in an order controlled andpredetermined in the delivery phase of the weft yarns.

This delivery occurs within a limited time and space interval, when thegripper moves into and pulls back from the cavity of the bringer gripperwhich has carried the weft yarns halfway into the warp inlet, picks upthe weft yarns and completes their run to the opposite side.

To describe the technical problem faced by this invention in greaterdetail, along with the peculiar difficulties and requirements of thegripper-type looms, reference will now be made to the process ofpresenting the weft yarns in these looms, as shown in a simplifiedmanner in FIGS. 1A and 1B.

FIG. 1A shows the fabric 1 already produced on the right side, and thewarp inlet already opened in the two planes 2 and 3 by the motion of theheads, not shown in the figure for simplicity. In the warp inlet, ateach of its openings and with the appropriate synchronization, one ormore wefts must be inserted depending on the patterns of the fabric tobe produced, and these wefts, or weft yarns, are delivered to a bringergripper 4 moved inside the warp inlet by a lance of a semi-rigid ribbon5, which wraps up and unwraps with an alternating rectilinear motion inthe sense of the double arrow 6, as a result of the alternating rotarymotion in the sense of the arrow 7 of the lateral driving wheels 8. Inthe most widely used looms the inserting of the weft yarn is done by apair of grippers cooperating with each other: the bringer gripper andthe taker gripper. They move by starting off from the two sides of thefabric and meet at the halfway line, where the bringer gripper 4, afterpicking up the yarn from the presenting device and completing its runover half the height of the fabric, delivers it to the taker grippercoming from the opposite side. After picking up the yarn, the takergripper pulls back and completes its run over the remaining half of thefabric's height.

For further details on the taker grippers reference can be made toEuropean patents Nos. 572.025 and 576.074, as well as to European patentapplication No. 95202072.5 by the same applicant. As a generalprinciple, the bringer gripper is designed with a hollow front end wherethe weft yarns are presented to the taker gripper, which is in turnshaped like a hook capable, while advancing, of dipping into the hollowend of the bringer gripper and, while retracting, of gripping andcarrying along these yarns, so as to complete their insertion into thewarp pick.

After thus being introduced into the warp inlet, the weft yarn, orsimply yarn, is inserted into the fabric by the motion of the reed, notshown in the figure for simplicity. In its alternating rectilinearmotion the body of the bringer gripper 4 moves along the dottedhorizontal trajectory 9.

The operation of presenting the weft yarn to the bringer gripper 4occurs by presenting some rods 11 which receive their weft yarn 12 fromtheir respective upstream reel. These presenting rods 11 are capable ofmoving between two places, an upper resting place and a lower deliveringplace for the respective weft yarn to the bringer gripper 4.

For the weft yarns' presenting devices, reference can be made to Italianpatent applications Nos. MI97/A01821 and MI97/A01822 by the sameapplicant.

As known from the state of the art, the weft yarn is presented to thebringer gripper at an appropriate angle with respect to its trajectory9. More precisely, the various weft yarns are presented according to acertain range of directions lying in a plane, always at a sharper orsofter angle with respect to the direction 9 of the forward motion ofthe bringer gripper 4. In its forward motion the bringer gripper, whileon its way into the warp inlet, successively crosses the weft yarns'various directions available, first those at a sharper and then those ata softer angle.

It must in fact be kept in mind that the bringer gripper is at themoment produced in a shape fitting the specific requirement of grippingonly the yarns it encounters at a sharp angle, and of absolutely failingto grip the yarns it encounters at essentially less than sharp angles.This requirement conforms to the need that in case the warp inlet is notperfectly open and the warp yarn is not fully raised or lowered, thebringer gripper 4 must not grip and tear it, but only deflect it fromits path, by raising or lowering it to the necessary place.

FIG. 1B gives an overall view of the situation after the yarn is grippedby the gripper 4 and after it has moved forward in the direction 9toward the open warp inlet. Downstream of the yarn presenting andgripping place, a cutting organ 14, conventionally pictured here as ascissors, intercepts the weft section between the moving gripper 4 andthe top of the warp inlet and cuts it, so that the weft yarn moved intothe open warp inlet is that unrolled from its upstream reel and does notaffect the yarn on the part of the fabric 1 which has already beenproduced. In fact, FIG. 1A shows the scissors in an open and FIG. 1B ina closed position, after cutting the yarn 12.

The technical problem of presenting the weft yarn turns more complexwhen two or more wefts are to be conveyed to the warp inletsimultaneously, by feeding them to the bringer gripper and deliveringthem from there to the taker gripper. These wefts may in fact turn outto be highly different in their dimensional characteristics and so on,or be presented at different stretching values or free lengths, so as tobe consequently gripped with greater or lesser efficiency by the bringergrippers and taker grippers.

In consideration of the fact that the wefts are gripped and held firm byV-type notches and/or elastic organs, it proves to be most important fora good fabricating result that the introduction of the yarn hardest toretain in the bringer gripper occur in a controlled sequence between theyarns 12, as in its delivery to the taker gripper. It is generallypreferable that the delivery of the most troublesome yarn to the takergripper should take place first. If one keeps in mind, again as ageneral principle, that the taker grippers are shaped like hooks of avery sharp V-type form, it is preferable that the yarn most troublesometo hold enter the V-shaped recess first, and that the less troublesomeyarn enter it thereafter.

SUMMARY OF THE INVENTION

The scope of this invention is to produce an advanced weft feedingdevice and processing system in gripper-operated looms, particularly incase of a simultaneous feeding of multiple wefts. The technical problemof enhancing the process of feeding the wefts to the textile process andthe device governing this phase of the process in gripper-operated loomstherefore essentially rests on the requirements of making two or morewefts available in differentiated and defined places in the bringergrippers, so as to present them in a pre-established sequence to thetaker gripper, and that the latter may be able to pick them up in thissequence, as well as to control the motions of moving the mentionedwefts into the bringer gripper.

This invention consists of a device and a feeding process of the weftyarns into looms without shuttles, particularly suited to thesimultaneous feeding of a multiple number of weft yarns to the textileprocess.

A bringer gripper for Jooms without shuttles is disclosed. The bringergripper has a boxy parellelpiped hollow shape, built from a lowerU-shaped bar and upper cover. The upper cover is fitted with a notch inwhich the weft yarn or weft is placed by the feeding reel, and incombination with a gripping organ is capable of capturing the weft onthe part turned toward the fabric to present the weft to the takergripper. The notch is shaped with a multiple number of throats ofdifferent axial lengths, so as to basically offset the weft yarns. Theweft yarns come to rest at the bottom of each of the multiple throats inthe direction of the axial motion of the gripper.

A method of presenting the weft yarns or wefts to a taker gripper of aloom without a shuttle equipped with a double gripper, and in particularfor the double feeding of one or more wefts into the inlet of the warp,is disclosed. The wefts are arranged in the bringer gripper in a manneressentially offset in the direction of the axial motion of the grippers,and the wefts are presented to the taker gripper in the order of theoffset arrangement. The order of presenting the wefts to the takergripper is determined by the insertion of the wefts into the bringergripper by placing them into a multiple number of throats of differentaxial lengths.

A platelet fitted with a projection having a rising profile on which theweft yarn is deflected into the bringer gripper is provided. Thisplatelet is linked to the stationary structure of the machine andassists the introduction of the weft yarn into the bringer gripper. Thislinkage is adjustable in the direction of motion of the bringer gripper.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B illustrate the technical problem in a general way;

FIG. 2 offers a prospective overall view of the bringer gripper 4according to the invention;

FIGS. 3A, B and C show a presenting and gripping sequence of the weft12, as presented by the rods 11 placed at the outer left and at atighter sharp angle;

FIGS. 4A, B and C show a presenting and gripping sequence of the weft12, as presented by the rods 11 sequence placed at the outer right andaccording to a softer sharp angle;

FIGS. 5A, B and C show details of the embodiment of the cover 30 of thegripper according to the invention; and

FIGS. 6A and 6B, 7A and 7B and 8A and 8B illustrate further developedembodiments of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

These figures show an embodiment of the invention in which two wefts aresimultaneously inserted into the warp inlet, while noting that theinvention may also be implemented for the simultaneous delivery of alarger number of weft yarns.

FIG. 2 shows the terminal portion of the bringer gripper 4 according tothe invention in a prospective view. Its structure consists of a boxy,hollow parallelepiped form, produced from a profile bar 20 with aU-shaped cross section similar to that of the bringer grippers alreadyknown in the art, and by a cover 30 with an upturned L-shaped crosssection. The tine 22 of the U-form on the observer's side has aninitially slightly curved-in section, on which a profile 23 is mountedfor the raising and lowering motion of the weft yarn 12, presented tothe gripper 4 during the latter's forward motion from left to right,which forces the mentioned weft to pass it during its motion. This weft12 is the one on the side connecting to the already produced fabric 1.The upper cover 30 in the shape of an upturned L is matched with a tip31 that overlays and engages the weft yarn 12 and feeds it along thedescending profile 32 applied on the vertical portion 33 of the upturnedL and substantially held parallel to the profile 23 applied to the tine22 of the U.

The cover's horizontal portion 34 is slightly narrower than the width ofthe underlying U-form. This generates a forced path 24 for the weft yarn12 between the profiles 32 and 23, which is picked up by the gripper 4and gradually lowered toward the base of the U.

A weft gripping organ 25 is placed at the end of the path 24, which isin itself already known in the art, for instance from U.S. Pat. No.5,113,914 in the name of the same applicant. It may, again forexemplifying purposes, be implemented with a gripping extension 26hinged in 27 and opposed to a part 28 of the underlying holder. Theinitial portion 29 of the gripping extension 26 is curved upward toinvite the introduction of the weft 12 coming from the path 24 within agradually narrowing recess. The gripping action of the weft on the partof the organ 25 may be achieved both by elastically actuating theextension 26, for instance by a spring, not shown in the figure forsimplicity, which reacts to the insertion of the yarn and presses itbetween the extension 26 and the opposing part 28, as well as by theeffect of the shape of the recess between these parts. The grippingorgan 25 picks up the weft 12 on the part facing the fabric 1.

The upper face 34 of the cover 30 is essentially horizontal; it isprovided with a placing notch for the weft yarn 12 on the sideconnecting to the feeding reels and passing through the presenting rods11. This notch 35 is matched with a weft entrance passage 36, which hasbeen picked up by the tip 31 and is with its opposite extremity runningalong the path 24; this notch continues upstream and offers the weftintroduced below the cover 30 a path which splits up into two throats 37and 38 separated by a rounded tip 39. The two throats 37 and 38 are madeof a different axial length, so that the yarns coming to rest on thebottom of each are essentially offset in the direction (9) of the axialmotion of the bringer gripper 4. The number 50 indicates the tip of thetaker gripper to be described below. The shape of this notch 35 and itsfunction in the overall design of the gripper is illustrated in thefollowing figures. The embodiment pictured here for simplicity shows anotch 35 shaped with two throats 37 and 38, but as a general principleit may be shaped with a multiple number of throats of different axialdepth, for instance with three or more.

FIGS. 3A, B and C illustrate the operation of the gripper in referenceto the presenting and gripping sequence of the weft 12, as presented bythe rods 11 placed to the outer left and at a tighter angle α. The rodsare indicated by the reference numbers from 11 a to 11 h, proceedingfrom the left to the right: the rods to the left 11 a, . . . presenttheir yarn 12 a, . . . at a sharp angle a with respect to the directionof motion 9 of the gripper 4 which is narrower than that of the yarn ofthe rods 11 h, . . . which present their yarn 12 h, . . . at a sharperyet narrower angle α.

FIGS. 3A, B and C refer to the rod 11 b which presents its yarn 12 b tothe gripper 4 while passing it in its forward motion in the direction 9.The yarn 12 b is connected to the left to its reel, and to the right tothe fabric 1. FIG. 3A shows weft yarn 12 b presented by the lowered rod11 b; it is picked up by the tip 31 of the cover 30 and passed under thecover 30 by its intermediate portion. FIG. 3B shows the gripper 4 afterit has moved forward with respect to its place in FIG. 3A; as a resultof this motion the weft yarn 12 b begins to follow the path 24 and inparticular the descending profile 32, but has still dropped only littledue to its very narrow angle a. On the other hand, the yarn 12 b findsitself opposite the tip 39 and fails, due to its still insufficientlowering, to be picked up by the mentioned tip 39 in order to enter thethroat 38, and continues its motion toward the bottom of the throat 37,where it stops as soon as it is picked up by the gripping organ 25. FIG.3c shows the gripper 4 after it has moved still further to the right; asa result, the motion of the weft yarn 12 b has completed its path 24,has been picked up by the gripping organ 25, and has been cut by thescissors 14 on the side of the fabric 1. On the other side the yarn isstill connected to the upstream feeding reel and rests itself at thebottom of the throat 37. The particular shape of the notch 35 of thecover 30 thus induces the yarns presented first and with the narrowestangle to place themselves inside the throat 37 placed on the sideclosest to the gripping organ 25, or to the part closest to the fabric1. The gripper 4 proceeds to the right and recovers some weft yarn fromthe reel, to convey it to the textile process. In the gripper 4 the yarn12 finds itself, inside the parallelepiped box, constrained between theinvitation to the throat 37 and picked up by the gripping organ 25, asshown by the dotted line.

FIGS. 4A, B and C on the other hand refer to the rod 11 g, whichpresents its yarn 12 g to the bringer gripper 4 passing it during itsforward motion in the direction 9. The yarn 12 g is also connected toits reel on the left, and to the fabric 1 on the right. FIG. 4A showsthat the weft yarn 12 g is presented to the lowered rod 11 g; in amanner similar to the former case, it is picked up by the tip 31 of thecover 30 and passed under the cover 30 by its intermediate portion. FIG.4B shows the gripper 4 in an advanced place with respect to that of FIG.4A; as a result of this motion the weft yarn 12 g has followed the path24 but has, due to its angle α, also dropped almost completely. On theother side the yarn 12 g running over the notch 35 has, when it meetsthe tip 39, already dropped sufficiently to be picked up by thementioned tip 39 and enters the throat 38, where it will stop and beunable to proceed further toward the throat 37 as in the previous case.FIG. 4C shows, in a manner similar to the previous case, that thegripper 4 has further advanced to the right; as a result of this motionthe weft yarn 12 g has completed the path 24, has been picked up by thegripping organ 25, and has on the part of the fabric 1 been cut by thescissors 14. On the other side it is still connected to the upstreamfeeding reel and rests itself at the bottom of the throat 38. In thiscase the yarn 12 finds itself inside the parallelepiped box of thegripper 4 and constrained between the invitation of the throat 38 andthe pick-up of the gripping organ 25, as shown in the dotted line, in aplace differing from that in the case represented in FIG. 3C. Theparticular shape of the notch 35 of the cover 30 thus induces the yarnspresented last and at the least narrow angle to the motion of thegripper 4 to rest themselves in the throat 38 set farthest away from thegripping organ 25, or on the side farthest away from the fabric 1.

From the foregoing description offered in reference to FIGS. 3 and 4 itis evident that it is the feeding path 24, and in particular thedescending profile 32 of the wall 33, that determines the placing of theweft 12 in one of the throats 37, 38, depending on the angle a by whichit is presented to the gripper 4.

FIGS. 5A, B and C illustrate two alternative embodiments of the cover30.

FIG. 5A shows a side view of the vertical wall 33 of the cover 30, withthe tip 31, the descending profile 32, and a part of the gripping organ25: the side view fits both alternative embodiments.

FIG. 5B shows a view of the upper wall 34 of the cover 30, in thealternative in which the throat 37B, closest to the gripping organ 25,is shaped with a lesser depth in an axial direction with respect to thatof the throat 38B, which has a greater depth in an axial direction.

FIG. 5B also shows the taker gripper 50 in a highly simplified manner,while it moves in an alternating manner according to the double-pointedarrow, meeting the bringer gripper 4, introducing itself in its boxypart up to the place shown by a dashed line, and finally withdrawingfrom the same. The bringer gripper 4 and the taker gripper 50 share thedirection of motion 9. In its forward motion, the convex portion of itsterminal hook 51 pushes aside the yarns present in the boxy portion ofthe bringer gripper 4 and overtakes them. During the return motion ofthe taker gripper 50, the yarns 12 present in the boxy portion of thebringer gripper—placed in the throats 37, 38 and held firm by thegripping organ 25—are picked up by the hook 51 in the cavity whichprovides some gripping devices that pick up these yarns 12 from thebringer gripper 4 and carry them along to the remaining portion of thepath in the open inlet of the warp, while continuing to call up someyarn from the reels placed upstream of their presenting rods 11.

As a general matter, the yarns entering the hook 51 first are picked upwith greater efficiency, and there is consequently a need to present thehook 51 to all those yarns, first and in a well-separated manner, thatturn out to be most difficult to grip, as already expected, due to somecharacteristics of their own or some presenting differences such asstretching, free length, braking, etc. The yarns picked up first by thetaker gripper 50 are those placed inside the throat of greatest depth,meaning those extending farthest to the left in FIGS. 5A, B and C.

In the case of FIG. 5B, the yarns 12 a, . . . , which are placedfarthest to the left and encountered by the bringer gripper 4 first,come to a stop in the throat 37B, being the one with the smallest axialdepth. These yarns 12 a, . . . are therefore those that the takergripper 50 will in its return path meet with its hook 51 in a latermoment, while it will meet the yarns 12 h, . . . first, which are placedfarthest to the right and met by the grippers 4 further on. These haveengaged inside the throat 38B, i.e. the one with the greatest axialdepth.

In the case of the embodiment shown in FIG. 5B, the yarns which aredifficult to pick up and grip effectively are placed in the adjacentrods farthest to the right 11 h; on the contrary, the yarns which areeasiest to pick up and grip are placed in the adjacent rods farthest tothe left 11 a. In the case of FIG. 5B, the wefts (12) presented to thebringer gripper (4) at a more open angle a are presented to the takergripper (50) before those presented to the bringer gripper (4) at atighter angle α.

FIG. 5C shows a view of the upper wall 34 of the cover 30, in analternative opposite to the previous one, in which the throat 37Cclosest to the gripping organ 25 is supplied with a greater axial depthwith respect to the throat 38C having a lesser axial depth. FIG. 5C alsogives a simplified view of the taker gripper 50, which moves as shown inFIG. 5B.

In the case of FIG. 5C, the yarns 12C, . . . , which are placed farthestto the left and met by the gripper 4 first, stop in the throat 37Chaving the greatest axial depth. These yarns 12 a, . . . are thereforethose that the taker gripper 50 will meet in its return motion with itshook 51 first, while it will meet the yarns 12 h, . . . , i.e. thoseplaced farthest to the right and meeting the bringer gripper 4 furtheron, in a second moment. These have come to engage in the throat 38Chaving a lesser axial depth.

In case of the embodiment shown in FIG. 5C, the technical solution istherefore the contrary of that in the previous case: the yarns mostdifficult to pick up and grip effectively are therefore placed in theadjacent rods farthest to the left 11 a; the yarns easiest to pick upand grip are on the contrary placed in the adjacent rods farthest to theright 11 h. In this case the wefts (12) presented to the bringer gripper(4) at a tighter angle a are presented to the taker gripper (50) beforethose presented to the bringer gripper (4) at a more open angle α.

The axial depths of the two or more throats 37, 38 of the bringergripper according to the invention, by which the yarns are presented tothe taker gripper in a well-differentiated place, are appropriatelydiffering from each other.

The reference to FIGS. 6, 7 and 8 describes embodiments of thisinvention marked by a still further refinement. This refinement refersto a case in which the yarns of the weft exhibit a different behaviorwhile being inserted into the bringer gripper.

FIG. 6A shows two wefts 12 b, g presented to the bringer gripper 4 bytheir rods 11 b, g. Let us consider for example the case in which theweft 12 b, met in its forward motion by the gripper 4 first, is becauseof any characteristics of its own or because of its manner ofpresentation, as mentioned above, marked by a more difficult forwardsliding action under the cover 30 and inside the path 24, for instancebecause it is a thinner, more pliable and/or “hairier” yarn; it willthus move forward more slowly. The weft yarn 12 g will on the otherhand, still as an example, have such characteristics as to move forwardin this path 24 more quickly, because it is a thicker, fartheroutstretched and less pliable yarn. The yarn 12 g will consequently, asshown in FIG. 6B, move into the gripper 4 at a later moment, but mayreach, push on, and even overtake the yarn 12 b.

Owing to the fact that it is generally preferable that the yarns to bepresented to the taker gripper 50 first should also be presented to thegripping organ 25 of the bringer gripper first, the behavior of the twowefts can be expected to be made more uniform by overcoming thereluctance of the upstream yarns, for example 12 b, to move along thepath 24 thanks to the following refinement.

This refinement consists in selectively interposing in the path of theweft yarns most difficult to run and to place farther upstream in theirpresentation, a fixed or controllable switch capable of modifying thepresentation angle to the gripper while being inserted into the path 24,by making it softer and reducing the length of the uncontrolled stretchin the direction of the fabric 1.

In the exemplifying yet non-limiting embodiment shown in FIGS. 7A and 7Bthis switch is fixed and illustrated as a platelet 60 fitted with aprojection 61 having a profile rising from left to right, on which theaffected weft yarn 12 b is deflected. In this embodiment the platelet 60is linked to the machine's stationary structure 62 by a linkageadjustable in the direction of motion of the gripper, by mounting it forexample with a pressure screw 63 inside an eyelet 64, so as to vary theplace of the platelet 60 in this direction and to deflect only a few ofthe yarns 11 a, b, . . . farther upstream, which are the most difficult,and not also the other yarns 11 h, g, . . . , which do not need it. FIG.7B shows that the gripper 4 has moved forward and that the weft 12 b isbeing intercepted by the rising profile 61: the weft moves up on it,enters the gripping organ 25 and then leaves it behind, after overtakingit. The weft yarn 12 g farther downstream is on the contrary notaffected, because the platelet 60 is adjusted so as to intercept onlythe yarns farthest upstream.

In the exemplifying yet non-limiting embodiment shown in FIGS. 8A and 8Bthis switch is controlled and illustrated as an electromagneticallyactuated device 70 fitted with an element 71 controlled to rise and fallso as to intercept the weft and/or to release it in the desired timesequence.

The device 70 is also linked to the machine's structure 62 by anadjustable linkage, mounted for example with a pressure screw 73 in aneyelet 74, so as to be capable of acting on a variable number of theyarns 11 a, b, . . . farther upstream, which are the most difficult, andnot also on the other yarns 11 h, g, . . . , which do not need it.

The device 7υ may be actuated to rise to a place 71 a in a mannercoordinated with the motion of the rods 11 a, b, . . . which present theweft yarns 12 a, b, . . . to be deflected by the same device. This makesit possible to vary the intervention of the switching device 70 to oneor more weft yarns by acting on the control unit of the frame, wheneverthe fabric to be produced varies. The frame's control unit takes care ofactivating the device 70 with the aid of the small cables 72. FIG. 8Bshows that the gripper 4 has moved forward and that the yarn 12 b isbeing intercepted, switched by the raised element 71, and helped toenter the gripping organ 25. The weft 12 b leaves the switch wheneverthe element 71 retracts, or after the weft has been cut by the scissors14. The weft yarn 12 g placed farther downstream is on the other handleft unswitched, because the device 70 is placed so as to affect onlythe yarns placed farther upstream.

What is claimed is:
 1. A bringer gripper (4) having axial motion (9) forinserting a plurality of wefts (12) from feeding reels to a takergripper (50) in looms without shuttles for weaving fabric (1), the loomincluding a plurality of rods (11 a, . . . 11 h) for presenting at leasttwo wefts (12 a, . . . 12 h) into the path of axial motion (9) of thebringer gripper (4), the bringer gripper (4) comprising: a hollow lowerU-shaped bar (20); an upper cover (30) fitted to the hollow lowerU-shaped bar (20) so as to form a parallelepiped hollow shape; agripping organ (25) capable of capturing the wefts (12) on a part turnedtoward the fabric (1) to present said weft to a taker gripper (50); and,the upper cover (30) fitted with a notch (35) in which the wefts (12)are inserted, the notch (35) being shaped with a multiple number ofthroats (37, 38) offset with respect to the axial motion (9) of thebringer gripper (4), to offset the wefts (12) during insertion by comingto rest at the bottom of at least one of the multiple number of throats(37, 38) in the direction of axial motion (9), during the axial motionof the bringer gripper (4).
 2. The bringer gripper (4) according toclaim 1 wherein: the throat (37) placed closest to the gripping organ(25) is made of a lesser axial depth with respect to the throat (38)placed on the side of the feeding reels.
 3. The bringer gripper (4)according to claim 2 wherein: the throat (37) placed closest to thegripping organ 25 is made of a greater axial depth with respect to thethroat (38) placed on the side of the feeding reels.
 4. The bringergripper (4) according to claim 2 wherein: the wefts (12) are eachdisposed along relatively angularly inclined feeding paths (24) withrespect to the axial motion (9) of the bringer gripper (4) to place thewefts (12) into one of the throats (37, 38) responsive to the angularlyinclined feeding path at which each weft (12) is presented to thebringer gripper (4).
 5. A method of presenting a plurality of wefts (12a, . . . 12 h) in a controlled sequence from a bringer gripper (4)having axial motion (9) to a taker gripper (50) of a loom without ashuttle equipped with a double gripper, comprising the steps of:providing a plurality of rods (11 a, . . . 11 h) for presenting at leasttwo wefts (12 a, . . . 12 h) into the path of axial motion (9) of thebringer gripper (4); providing a bringer gripper (4) including: a hollowlower U-shaped bar (20), an upper cover (30) fitted to the hollow lowerU-shaped bar (20) so as to form a parallelepiped hollow shape, agripping organ (25) capable of capturing the wefts (12) on a part turnedtoward a fabric (1) to present said weft to a taker gripper (50), andthe upper cover (30) fitted with a notch (35) in which the wefts (12)are inserted, the notch (35) being shaped with a multiple number ofthroats (37, 38) offset with respect to the axial motion (9) of thebringer gripper (4) to offset the wefts (12) during insertion by comingto rest at the bottom of at least one of the multiple number of throats(37, 38) in the direction of axial motion (9), during the axial motionof the bringer gripper (4); inserting the multiple wefts (12 a, . . . 12h) into the bringer gripper (4) to come to rest at the bottom of themultiple throats (37, 38) in a manner offset in the direction (9) of thegrippers (4, 50) whereby the wefts (12 a, . . . 12 h) are arranged tothe multiple throats in the controlled sequence; and, presenting thewefts (12) to the taker gripper (50) in the order of the controlledsequence.
 6. The method of presenting a plurality of wefts (12 a, . . .12 h) in a controlled sequence from a bringer gripper (4) having axialmotion (9) to a taker gripper (50) of a loom according to claim 18 andincluding the further step of: varying the angle at which each of thewefts (12 a, . . . 12 h) is presented to the bringer gripper (4) withrespect to the axial direction of motion (9) of the grippers (4, 50) todetermine the controlled sequence in which the wefts (12 a, . . . 12 h)are arranged in the bringer gripper.
 7. The method of presenting aplurality of wefts (12 a, . . . 12 h) in a controlled sequence from abringer gripper (4) having axial motion (9) to a taker gripper (50) of aloom according to claim 19 and wherein the varying the angle at whicheach weft (12) is presented to the bringer gripper includes: providingthe bringer gripper (4) with throats (37, 38) so that the throat (37)placed closest to the gripping organ (25) is made of a lesser axialdepth with respect to the throat (38) placed on the side of feedingreels so that the wefts (12) presented to the bringer gripper (4) at atight angle are presented to the taker gripper (5) before thosepresented to the bringer gripper at a more open angle.
 8. The method ofpresenting a plurality of wefts (12 a, . . . 12 h) in a controlledsequence from a bringer gripper (4) having axial motion (9) to a takergripper (50) of a loom according to claim 19 and wherein the varying theangle at which each weft (12) is presented to the bringer gripperincludes: providing the bringer gripper (4) with throats (37, 38) sothat the throat (37) placed closest to the gripping organ (25) is madeof a greater axial depth with respect to the throat (38) placed on theside of feeding reels so that the wefts (12) presented to the bringergripper (4) at an open angle are presented to the taker gripper (50)before those presented to the bringer gripper (4) at a tighter angle. 9.The method of presenting a plurality of wefts (12 a, . . . 12 h) in acontrolled sequence from a bringer gripper (4) having axial motion (9)to a taker gripper (50) of a loom according to claim 19 including:interposing in the path of the wefts a switch for modifying an angle ofpresentation of wefts (12) to the bringer gripper (4).
 10. The method ofpresenting a plurality of wefts (12 a, . . . 12 h) in a controlledsequence from a bringer gripper (4) having axial motion (9) to a takergripper (50) of a loom according to claim 22 wherein the interposingstep includes: mounting the switch to a platelet (60) fitted with aprojection (61) having a rising profile on which the weft yarn (12) isdeflected; and, linking the platelet to a stationary structure (62) ofthe machine, by a linkage adjustable in the direction of the axialmotion (9) of the gripper.
 11. The method of presenting a plurality ofwefts (12 a, . . . 12 h) in a controlled sequence from a bringer gripper(4) having axial motion (9) to a taker gripper (50) of a loom accordingto claim 22 wherein the interposing step includes: providing the switchwith an element (71) controlled to rise and fall to change the angle ofpresentation of at least one of the wefts (12 a, . . . 12 h) to thebringer gripper (4).
 12. The method of presenting a plurality of wefts(12 a, . . . 12 h) in a controlled sequence from a bringer gripper (4)having axial motion (9) to a taker gripper (50) of a loom according toclaim 24 and further including: controlling the element (71) to rise orfall in coordination with the actuating of rods (11 a, . . . 11 h) whichpresent the wefts (12 a, . . . 12 h) to be deflected.
 13. The method ofpresenting a plurality of wefts (12 a, . . . 12 h) in a controlledsequence from a bringer gripper (4) having axial motion (9) to a takergripper (50) of a loom according to claim 18 and including the furtherstep of: varying the angle at which each of the wefts (12 a, . . . 12 h)is presented to the bringer gripper (4) to reduce the length of theuncontrolled stretch in the direction of the fabric (1).